JPH051548B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a magnetic recording/reproducing device.

Conventional configuration and its problems Conventional video tape recorder (hereinafter referred to as "VTR")
), for example, when a timer is programmed with several programs that are not consecutive in time,
When recording a certain program, then going into stop mode, unloading, and then loading again (hereinafter this case will be referred to as "splicing via stop"), the recording state of the tape at that time is shown in Figures 1 to 1. This will be explained using Figure 4. Figure 1 is a schematic plan view of the tape running system during recording;
The figure is a schematic plan view of the tape running system when stopped. 1 is a cassette case, 2 is a take-up reel, 3 is a supply reel, 4, 7, 10, 11, 13, 14, 16, 1
7 and 18 are posts, 5 is a capstan, 6 is a pinch roller, 8 is an AC head, 9 is an impedance roller, 12 is a cylinder, 15 is a full erase head, and 19 is a tape.

When the tape is running as shown in Figure 1 in the recording mode and the stop mode is selected, the tape 19 that has been unloaded and wound around the cylinder 12
is wound up on the supply reel 3 and stored in the cassette case 1, as shown in FIG. Then, when the recording mode is set again, the capstan 5 is controlled so that the vertical synchronization signal of the video signal and the control pulse are in phase synchronization for a certain period of time after loading, and the vertical synchronization signal of the video signal and the cylinder 12 are
The cylinder 12 is controlled so that the phase detection head (not shown) for detecting the position of the video head of the video head is synchronized in phase, and the previously recorded video signal pattern and the video signal pattern to be recorded this time are synchronized. After controlling the video signal so that the video signal is not disturbed at the joint between two programs, the system enters signal recording mode. Therefore, after loading, the tape advances by a certain length for phase adjustment, and then the actual recording mode begins.

The recording state of the tape 19 at this time can be divided into the following two cases in conventional VTRs. First of all, when unloading, applying a brake to the take-up reel 2 to wind up the tape 19 will damage the tape 19, so some VTRs allow the take-up reel 2 to be freed for unloading. FIG. 3 shows the tape running operation and tape recording state when performing continuous shooting via stops in such a VTR. Figure A shows the tape before splicing, and Figure B shows the tape after splicing. When switching from recording mode to stop mode at point a, tape 19 is unloaded.
When winding up by the supply reel 3, the take-up reel 2
Since the tape 19 is free, the tape 19 is pulled by the winding force of the supply reel 3, and the tape 19 comes out from the take-up reel 2 and returns toward the starting end of the tape 19, resulting in a point b. It will be rewound until. After this, when the recording mode is changed again, the recording mode is loaded, advances to the phase matching point c, and then recording is started. Therefore, in this case, since program B is recorded from point c, program A will be erased in area d.
This area d is determined by the winding force of the supply reel 3 during unloading, the load on the take-up reel 2 at that time, etc.
The last scene of the movie is erased.

On the other hand, in the second case, when unloading,
Even if the take-up reel 2 is fixed by applying the brake,
This is a VTR in which the tension of the tape 19 is controlled to prevent the tape 19 from being scratched. FIG. 4 shows the tape running operation and tape recording state when continuous shooting via stops is performed using such a VTR. In the same figure, A is the tape before splicing.
Figure B shows the tape after it has been spliced. In this case, if continuous shooting is performed via the stop at point a, the tape position remains unchanged at point a because the take-up reel 2 is fixed during unloading. When switching from stop mode to recording mode, the program progresses to point c after loading and phase alignment (at this time, no control pulse is recorded on tape 19, so capstan 5 rotates only by speed control), and program B is recorded from point c. be done.
In this case, as shown in FIG. 4B, there is an area e between program A and program B where no signal is recorded, resulting in noise at the joint.

Purpose of the Invention The present invention solves the above-mentioned conventional drawbacks, and provides magnetic recording and playback that does not erase the previous program or cause noise between programs even when continuous recording is performed via stop. The purpose is to provide equipment.

Structure of the Invention In order to achieve the above object, the magnetic recording and reproducing apparatus of the present invention includes a supply reel driving means for rotationally driving a supply reel, a take-up reel brake means for applying a brake on a take-up reel, and a capstan for rotationally driving a capstan. A capstan drive means, a control means for controlling the supply reel drive means, the take-up reel brake means, and the capstan drive means; and applying a brake to the take-up reel and winding the tape by the supply reel during unloading, applying a brake to the take-up reel and feeding out the necessary tape at that time from the supply reel during loading; When starting recording, the tape is returned by a predetermined length by the capstan driving means after loading is completed, and then recording is started, or after the tape is returned by a predetermined length by the capstan driving means when unloading from the loading completed state. It is configured to allow unloading.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 5 is a circuit block diagram of a main part of a magnetic recording/reproducing apparatus according to an embodiment of the present invention. The mechanism is the same as the conventional example shown in FIGS. 1 and 2, so it will be explained using FIGS. 1 and 2 as well. In FIG. 5, 20 is a mechanism control circuit, 21 is a loading position detection circuit, 22 is a loading motor drive circuit, 23 is a capstan motor drive circuit, 24 is a take-up reel brake means, and 25 is a supply reel drive circuit. be. The mechanism control circuit 20 is a circuit that controls all mechanisms such as each motor in the magnetic recording/reproducing device, and the loading motor drive circuit 2
2. It controls the capstan motor drive circuit 23, the take-up reel brake means 24, and the supply reel drive circuit 25, and information about the current loading position is input from the loading position detection circuit 21. . The loading position detection circuit 21 is a circuit that detects the current loading position. For example, when loading, it drives the loading motor, and when it receives information from the loading position detection circuit 21 that it has reached the loading completion position, it starts loading. It is used for control such as stopping the drive of a motor. The loading motor drive circuit 22 is a circuit that rotates the loading motor in the loading and unloading directions, and winds the tape 19 around the cylinder 12 and stores it in the cassette case 1. The capstan motor drive circuit 23 drives the capstan motor to rotate the capstan 5 in forward and reverse directions. The take-up reel brake means 24 is means for applying a brake to the take-up reel 2 and fixing the take-up reel 2. The supply reel drive circuit 25 is a circuit that drives the supply reel 3 in the forward and reverse directions.

When the tape running system is in the stop mode as shown in FIG. A command for the supply reel 3 to rotate in the direction in which the tape 19 is wound is outputted, and an unloading command is outputted to the loading motor drive circuit 22, respectively. When the loading position detection circuit 21 inputs information that the tape has reached the stop position and the tape running system has become as shown in FIG. 2 to the mechanism control circuit 20, the mechanism control circuit 20 controls the loading motor drive circuit. A stop command is output to 22. After that, when the recording mode is entered again, the mechanism control circuit 20
outputs a brake command to the take-up reel brake means 24 and a loading command to the loading motor drive circuit 22, and when loading is completed by the loading position detection circuit 21, the first
When information is input that the tape running system has become as shown in the figure, a stop command is output to the loading motor drive circuit 22. This allows loading
The tape position does not move during unloading. After that, the mechanism control circuit 20 sends a command to the capstan motor drive circuit 23 to rotate the capstan 5 in the opposite direction, and returns the tape 19 sandwiched between the capstan 5 and the pinch roller 6 crimped thereto by a certain length. . Tape 1 to be returned at this time
The speed and rotation time of the capstan 5 are set so that the length of the tape 9 is the same as or slightly shorter than the length of the tape required for phase alignment at the start of recording thereafter. After returning the tape 19, the capstan 5 is rotated in the normal direction to perform phase alignment, and then recording is started.

FIG. 6 shows the tape running operation and tape recording state when this control is performed. Figure A is the tape before splicing, and Figure B is the tape after splicing. While recording program A, when switching to stop mode at point a and then switching to recording mode to record program B, the tape position does not change during unloading and loading during this time.
It remains at point a. After loading, rewind to point b, then adjust the phase to point c, and then
Start recording. The length of the tape 19 for rewinding from point a to point b and the length of tape 19 for phase matching from point b to point c are both controlled by the capstan 5, so they can be set with high precision. . Therefore, points a and c can be set at the same position or slightly ahead of point c, without erasing the end of program A, and without causing noise between program A and program B. Program B can be recorded without causing any problems.

In the above embodiment, the tape 19 is rewound after loading in the recording mode, but when changing from the tape running system shown in FIG. 1 to the tape running system shown in FIG. 2, the tape 19 is rewound before unloading. It may be configured such that when the recording mode is changed from the stop mode to the recording mode by rewinding, the phase adjustment is performed without rewinding after loading is completed.

Effects of the Invention As described above, according to the present invention, when continuous shooting via a stop is performed, it is possible to prevent the tape position shift that conventionally occurs, and it is possible to improve the accuracy of continuous shooting. Also, from a cost perspective, it is possible to simply change the output timing of the microcomputer used in the current mechanism control circuit.
In other words, since only a program change is required, it can be implemented without increasing costs.

[Brief explanation of drawings]

Fig. 1 is a schematic plan view of the tape running system of the magnetic recording/reproducing apparatus during recording, Fig. 2 is a schematic plan view of the tape running system of the magnetic recording/reproducing apparatus when the magnetic recording/reproducing apparatus is stopped, and Figs. 3 and 4 are conventional FIG. 5 is a circuit block diagram of the main part of the magnetic recording and reproducing apparatus according to an embodiment of the present invention. The figure is an explanatory diagram of the running of the tape and the recording state of the tape during continuous shooting via stops using the same magnetic recording and reproducing apparatus. 2...Take-up reel, 3...Supply reel, 5...
Capstan, 19... Tape, 20... Mechanism control circuit, 23... Capstan drive circuit, 24... Take-up reel brake means, 25
...Supply reel drive circuit.

Claims (1)

[Claims] 1. A supply reel drive means for rotationally driving a supply reel, a take-up reel brake means for applying a brake on a take-up reel, a capstan drive means for rotationally driving a capstan, and these supply reel drive means, take-up reel brake means, and capstan. and a control means for controlling the drive means, which operates the take-up reel brake means and the supply reel drive means during loading and unloading, and applies the take-up reel brake and the supply reel during unloading. Therefore, the tape is wound up, and during loading, the brake is applied to the take-up reel, and the necessary tape is fed out from the supply reel, and when recording is started, the tape is returned to a predetermined length by the capstan drive means after loading is completed. 1. A magnetic recording and reproducing apparatus configured to unload a tape after returning the tape by a predetermined length by the capstan driving means when starting post-recording or unloading from a loading completed state.